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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdeb502aa27739626dab97aaaf95c5c11652760217679019abd5cb1792867269' 
  AND token = 'IpZiAi2XVUJS39t65XnXYfGFzgNQnhuM7U3MjrH7XOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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