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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bde487b0c75623bd02fc150d621e73847fff5e88c45275ed04ef0a37ec1fbb2' 
  AND token = '3soIvL8ejbhF89Ptk4TneW06ifSVRQZpCdJJLLHYi4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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