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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bee64da06bcead81ee0039da4b972116d842ffd30bd034c4d19ca5e88fffe9' 
  AND token = 'uCar1m7biGu1m1bCy1mjv+Nj+/Bf6NR43rYZPapvmVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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