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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be8f8c94c9802e7cb85f474e9f1f7eb0f47b1127f6a037edd1be882f06f6855' 
  AND token = 'YO68XVAhyXli5KVAXbbRK5qNvmXQtd3Bw6+rkJ1QN/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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