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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45994134e5a4ab8571b6d89413e9b5188076f2b79ee697661727a636701d025b' 
  AND token = 'IxrgTerD14SPuiuIBHRUUo/Z2uWFPmAw25zfahjfbd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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