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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539cd9279d623d83669219c1e50576f085fb7625bb202be0cd8233bca131911f' 
  AND token = 'CcsfGYR7vbq2Qlot1cG7mBDvx8nyUV7kitieeX5hqyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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