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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3358fc123c7d49fdb4728eefee114d0147cda69e2d3db583d23b645d1c9750' 
  AND token = '9X6NTZKHDZWYp3mk7eaE4ysQ0c1F0x/ZlHJOUhpPuew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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