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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b59b24c95f1bc948d6baca85718fb8563a32649c1bb59bfd88c1b35f001aed' 
  AND token = 'x8Md0ONiVd69LjFcdZQ0BSQRIjjS1zvBIg8gYhpc+X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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