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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b5e36a690288550a8d4b26b0d23787c3011a5502f5667fa0584669bfbd55e6' 
  AND token = 'sM4MbDakVWIHYVwknShf5CbIVLV6QKOh5ZYMoBGxo/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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