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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999de9e7e776656e248165574945fe26f2d1de5be696d2a307827ab9c1111249' 
  AND token = '2/SK47o2UnIoU/y8go+iW7Yo/mS9xm7SLkdRucWgFnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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