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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea1e246ceceb00f938207165183dacc414dee8d4815c308381222decabfcf92' 
  AND token = 'mVUydNesJMnVeb3y3gK1SA6+yHFFb/VFXlztrUb6SyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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