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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b01108fddba27078a9a0a48698f0be0fa9844e6775897dbb47bb0cecb69fa7e' 
  AND token = 'PEspxGkh/JnQxVV2JPsoBMLbIGoVOMCAWr1U8Rv/7/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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