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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c949d19fed7447f9d57a9d640cbdc845e0d5633f59976ac02e5844f095a0c025' 
  AND token = 'QTv7SYms7lXwBJtICWdYjEuCE9vTh9CHzcj+ZsC69I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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