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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab5412b547797ee03ff92181cf79a4c81907755911e7b9c71221b53e84030b2' 
  AND token = '3JBQbqawea+gpOEh95gjz9SwmsRb+8U9moBdZFX8tzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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