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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5caac9de9915f619ef66f71f724244bac6d306e08f70713a928440e907359a' 
  AND token = '/uf7ws656QThAEUi0LLpxt4Ewf/vo3TwYcocYikglGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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