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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbb5870e7e98236a459e196028cc022881f8c38d234e3407def990b2c19bbbe' 
  AND token = 'bgxI6khkfHCFKnKi+jGCbev91YovofZFSO0pG4IAth4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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