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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914b35cb9e03065efe3cb83814fc85da1ea0d4a5b8728b8fbfa04f1563525e86' 
  AND token = 'McdF+9M62VEFXkR0HjldTpfdXXv8qTaon1uz7tvrATE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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