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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628568df948b0b76b00282a2dc4d8d040cd8c84c0c78c6092dcda5851a6cd521' 
  AND token = 'du0CP87UARTkRvX4/OBuUGsCAsCUHi/sGlSQyzYHajU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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