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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17a52d04bf5c860ecae1e77c436309786606e0dc29d2173e91e870b59f6dfae' 
  AND token = 'mLRC3YsBE1BDZwikKNvwMYDTg+SOWPMJc4HoRxZB+Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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