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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b41c50eb93e9a8bb76a9f874e283891d8a7848f641423aed829dc0d0e6d81e8' 
  AND token = '97TBpy8iBiuZrTEZ+DPdtNN8ORZNswVRgmpxg/y6Yk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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