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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6228caac35a0da7f424b42a785ff7d75baf85578fbb5cde11450c6604c4abd95' 
  AND token = 'aPMvWkK6cnUvb2iigHObEcFPGkRZL1zSdg1r3dMHy8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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