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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ca535a062453f2ffcef114624adf82e0952e515b2bafa7cf28f7aa01e7a3b0' 
  AND token = 'b8fuFNu7MPBCjSxx4D/ZL++R0y7wl3Dck+Dm2Jh/BfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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