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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6c0665f9fb82cb81330793c766779c7759daa2a243c65f42ab8537e49e0a2e' 
  AND token = 'IHFDgKCjxWJ8zEdUMGJAk8LsIfTn384Er70pIa+45qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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