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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8601f43c8f174154baa5c8dfa3e3afaff36ecf1710dbae92bd87970949ebbc1' 
  AND token = '1nNDa2CDJjRWTbA+JfakuqgeVZCYVjzYKuMBiF8rmcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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