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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed3554422d132ac20595dc7097752b1a94111d1065ef419908b11fc74924034' 
  AND token = 'kASoKN7YB7Q2v/YnYts1YtZpmjW9Rtm7UbRJJCq0/U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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