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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3fa02b91c5737d96ec9cd7ab0e921e34e689a20b35500fe8be421cd0409b8e' 
  AND token = '8vUPCPbNoftc48oHkOmyEMp4oKSuTB61nu194NLKiCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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