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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec666237880b87545d9bdd444f4c022ee0c053b19fa1c27404c73e863a48b9db' 
  AND token = '3p5sEqT9BEch1xynpjqtR5rjyl7u5NAv3iCpCBB56w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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