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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1682d14768d2def6a2d51fc83a29d2d20d2a7559339b8b220f4a96a17e9052e7' 
  AND token = 'AND22/bvqm21rA6vGErYSltQcFivRr0Evd4H9revkL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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