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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77142a6ab6be099aaac0c4b3793d11b879f92cc71707b99520eb7392455c5568' 
  AND token = 'yBH1H2UwjUfA++yBQZ/yCKJuA5T5wTsmsHTgTxuGMWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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