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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899688d79c8e7db14cdd244f3733b01fa4edc46f57f7a6a1bc4d6a3f0415c0be' 
  AND token = 'sclqzsF6XYrcUDqL1JaZ0fGf4vmFRChH9dqJ4IHOqzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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