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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c440a2bb648e59e3852c1026f0d763b88a8d1ffd5f74dfa1b7428c4ab1af4b' 
  AND token = '7b1QqqREh147sqKGiuSRHOFN6LbEcuAw4IFBu6mc/Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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