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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f3e0ac5d0ca4f198d5126969484aa1c69e9d89230f4c9285455d392a580b72' 
  AND token = '/gatCtTNxUIzoivY1ACUJ7TXj34WFhWESfLuED9a5NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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