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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c271bd98747ce559059fab056a6cc422469fe2e4a6ec4a1f8292e49b86c21534' 
  AND token = '4Ab/lNAwwZE8CBac1I/1tu8LYiCk2W8gJgAvkyv2sWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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