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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c93819d5b3c9718c057498fded7c7e5a72ce71b2ed5d1518a1fa40cf2e3711' 
  AND token = 'nngpPspDbZahL/+grYTTWN6Lfg24oHVYpJF4N1xhfyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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