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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863df663ce6a81b98c0e2dc43282b24f37bb90f54c381172389914b5c107e47b' 
  AND token = 'K/tQ4ipQFFBWChf4f8GhQ9+cruTK5txkRLQ+Df0CaD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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