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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcdfb66034de7e50c70852f3861137b41cb3ec2d47849b9fafebdff7a179455' 
  AND token = 'SQC+vTm0syv92roTUu9zN0M3lENYxTzH3iviqWGMucI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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