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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214a5d1b07f5cee0b4193d7f832550c3eee67231ce471cb6bb3aa7e75b97bf03' 
  AND token = 'jmfLS7pjzy3ibiGGbFdJ+4ArqF/6Az7LtawyiYhwUOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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