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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23dd4e499e4e076658d334b8a35a0d02c46bfbe0eeafb8e6048194760bf0d2d2' 
  AND token = 'Wkp3I1oDc4ob7/y453CCNkZAXrCvlWpp5Ykr++g1QiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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