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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8feda865a7ec7c29b758ebc8106334c7eb034ffcf14da785be393ad0e1eef69e' 
  AND token = 'o3mQo2IH5a6b5wpL1tjhL3lpXENwUlxTncK7wZoXufk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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