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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ba864e1ea13c9bcb8e8d8c63f5ac5dbf2115fd329d24c5e40d82b83b13820c' 
  AND token = 'G52KGWbYq9ZBREU+IX0Sqgd3Q8oWsX4tJ9yJWUxOFRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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