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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545a056297c2bf3a40704ae90290470f2b2f3bd9285ce3caf240ab54be363d9d' 
  AND token = 'VpXnkbxy3/2JbgbP2EmtmrNWcx1u4owTO0D8GSyDn8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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