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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76346fcad9d5c7481edcfe52fc153138143f3242b1f02e4535ad955a4dd43da' 
  AND token = '+1Tkw5NugiY9RdYg9J4qp/xwPhwNknNd7HiIwr4Zuxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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