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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692f1e21101506feb9b1f7a55ed06a6251002baed4c79c8fec11aefb04e2c475' 
  AND token = 'Wg/OBhE27eW5SIAFZIZEKGCQMOca3YBmekk+a2+I208=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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