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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31e3aa8f3ef42a8073cb2eab3c0b11ee692396e3f8ad1cb86c64978f84095d2' 
  AND token = 'Mwa+9fKAUHVTYrFSp5OK69NTxdGB4wl5Kf6PUBY5BS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}