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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adea7be891c685d5a6433185de9fbfd11d92b60254e26611c9c4b27cd44e096d' 
  AND token = '/FCFQKAOf6kKv/KFqnIFSGYf+vHPmd6XDvh6Gqqfhkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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