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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436e56d11db00ecd5d73431de6b2a2f0ff57cf695d23024a79c772dc732321f8' 
  AND token = 'twJH97q1QI6KsnPNPyQ03D46Fo0OPuuthG4HKMWuGGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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