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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d7b30abd1be81e644b826ef57672e28d9655244e7d380fa1563d3c3b1ed63f' 
  AND token = 'FsFpFysvRkdbJzujUtSzYSLG7r2kdvCLJmdg96OMc4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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