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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59a8991d53d3b367619d4e645ba819c3acce437ca81f7d72ffb4cb2c7aa52fc' 
  AND token = 'TW7ev2QurKLNspGEKOP5AbUktShf70yB2rfOy0WtlT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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