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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93f05cdae7db622ed7c47f17c4f089993afc86f0169d41f25d51125506a0a2a' 
  AND token = 'FtnKnqHZjFu2LUkh2ME5s5smLSJslcWNx8834h11pM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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