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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173a5b874c25e6aee415c3b0809a70bfb1a711420d565618c6bff1d7596f2f77' 
  AND token = 'Z5J4AIBRCj18SXNeHoyjJLL9tMzd2veuAVjA59HqDkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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