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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0afd961bcf361b093e17611a9609eb69d358b787bdbacd236eccf9f10def64c' 
  AND token = 'lh4esoCS79hyhiu83VJijny9W4bNzLhU4yhtrPJHRUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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