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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94231ab7636fcd63b2f06761d1deb76eaac1e207810ba73eb89515b249d38ead' 
  AND token = 'TpWE4ZjEXS3hjVLLflMXBgDa9TaKPyds33qUygZcksU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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