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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021df61d6580593e2137602c7b9864903add6d1a61eb360acaf9099a01134cd7' 
  AND token = '0/c0CobFTY/fT0YksJN1Hzho6gsmbwQGMHukI9KPuCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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