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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df9b1e87fedac4646b32fcb1e1a4362e4d86cc5ff22d57576f2615618b84d9b' 
  AND token = 'QbGoZ1jeQrFcnlA6iBC/q1rQBq8FF6Io/DMLRnUKwuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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