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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42764f78e037229cd0c95d49aab3449edb1ec4bb1aa01dc86d20bfe9fd298241' 
  AND token = 'IZkeh1Gukpbda3KAFvPWdNInDo9A1yjuD5W+z7nKkCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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