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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bb2f0c847dc9f47c95c8bfb4efeaac225fb1c62ed4846287b4c3864a7f3ca8' 
  AND token = 'j2XXGqI1ZV78NaoeoRG/ZOiUruzEPdaOz2hA9s5lBys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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