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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f80b4e2b9dc79832d8f307cdf2d6d42aca344943ccdd9ff0da35e11a17118f0' 
  AND token = '685+r5Jm/SOsuO0n2dP+ss3QgyUSfV2wmRwARSO98H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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