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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d94540f292eb5ecfef2e848d3229ac386d00824b9e99cb91e3e49bbc3bdf40d' 
  AND token = 'HN9/RHQCu/VQzeHTV6Ad2/1wg6e4qD2j/dinFNXGWh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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