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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19814bbe6fe92a08dad75b7f1d4b9253906d3699f676d7f13c691aaa675848a4' 
  AND token = '7zWwveAcLmmT93Ng3B+S5rAiTl28GSC/oafWJ7l8LHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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