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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35a5901344142a6fa262d8364519b294656ec51016e4f4f88d7eb5c32b5f275' 
  AND token = 'mpkDUvsEOTdeGITZDb5+qD9yWJvS0ADNC8sKTEeqcE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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