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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6526de12f02b75efe696f904162328b98ad97a6742cae6c301161fb881ed2e' 
  AND token = 'JZ33AS4cUQAf3W/XbLQxitEB4xr7jyVoHVkp4P6J14o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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