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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1f436ed937b666b474da452d1eb01089b4fb89b6c2eee0235cbe3798945c2f' 
  AND token = 'xAx2lTVt78qWC27r6Y+TiCZoX7Wxelwe42DfTHdGwbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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