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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8daf1664aa7ad0d3f86a2b64c44d1537f6bd4735510d6bd94c34ccf50dd4dc81' 
  AND token = 'lQiGJI8ivbiVu7UQ9mM1XpHu87Qdr9enFU7FQGINV8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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