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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca96af19c1d4f88bdbcbf4b993288f11da15a4f40065db1bc54c360dceae3545' 
  AND token = 'dvSu+jJM9xb/KU6uOgEejbDHGlZueTAuSOkcMyVh0YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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