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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1641f0487461be77a8ba0873baff080a541e7903f746dfa8c7bbc5b1a888ee' 
  AND token = 's9GDAE0tT3VBybExYUvUXqOcnDDBzUhQgj02oVVFBRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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